/* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
*
* Data Differential YATL (i.e. libtest) library
*
* Copyright (C) 2012 Data Differential, http://datadifferential.com/
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
*
* * The names of its contributors may not be used to endorse or
* promote products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include "libtest/yatlcon.h"
#include <libtest/common.h>
#include <csignal>
#include <libtest/signal.h>
using namespace libtest;
#define MAGIC_MEMORY 123569
bool SignalThread::is_shutdown()
{
bool ret;
pthread_mutex_lock(&shutdown_mutex);
ret= bool(__shutdown != SHUTDOWN_RUNNING);
pthread_mutex_unlock(&shutdown_mutex);
return ret;
}
void SignalThread::set_shutdown(shutdown_t arg)
{
pthread_mutex_lock(&shutdown_mutex);
__shutdown= arg;
pthread_mutex_unlock(&shutdown_mutex);
if (arg == SHUTDOWN_GRACEFUL)
{
if (pthread_kill(thread, SIGUSR2) == 0)
{
void *retval;
pthread_join(thread, &retval);
}
}
}
shutdown_t SignalThread::get_shutdown()
{
shutdown_t local;
pthread_mutex_lock(&shutdown_mutex);
local= __shutdown;
pthread_mutex_unlock(&shutdown_mutex);
return local;
}
void SignalThread::post()
{
sem_post(&lock);
}
void SignalThread::test()
{
assert(magic_memory == MAGIC_MEMORY);
if (bool(getenv("LIBTEST_IN_GDB")) == false)
{
assert(sigismember(&set, SIGALRM));
assert(sigismember(&set, SIGABRT));
assert(sigismember(&set, SIGQUIT));
assert(sigismember(&set, SIGINT));
assert(sigismember(&set, SIGVTALRM));
}
assert(sigismember(&set, SIGUSR2));
}
bool SignalThread::unblock()
{
int error;
if ((error= pthread_sigmask(SIG_UNBLOCK, &set, NULL)) != 0)
{
Error << "While trying to reset signal mask to original set, pthread_sigmask() died during pthread_sigmask(" << strerror(error) << ")";
return false;
}
return true;
}
SignalThread::~SignalThread()
{
if (is_shutdown() == false)
{
set_shutdown(SHUTDOWN_GRACEFUL);
}
#if 0
if (pthread_equal(thread, pthread_self()) != 0 and (pthread_kill(thread, 0) == ESRCH) == true)
{
void *retval;
pthread_join(thread, &retval);
}
#endif
sem_destroy(&lock);
unblock();
}
extern "C" {
static void *sig_thread(void *arg)
{
SignalThread *context= (SignalThread*)arg;
context->test();
context->post();
while (context->get_shutdown() == SHUTDOWN_RUNNING)
{
int sig;
if (context->wait(sig) == -1)
{
Error << "sigwait() returned errno:" << strerror(errno);
continue;
}
switch (sig)
{
case SIGALRM:
case SIGVTALRM:
Error << strsignal(sig);
if (gdb_is_caller())
{
abort();
}
exit(EXIT_FAILURE);
case SIGABRT:
case SIGUSR2:
case SIGINT:
case SIGQUIT:
if (context->is_shutdown() == false)
{
context->set_shutdown(SHUTDOWN_FORCED);
}
break;
case SIGPIPE:
{
Error << "Ignoring SIGPIPE";
}
break;
case 0:
Error << "Inside of gdb";
break;
default:
Error << "Signal handling thread got unexpected signal " << strsignal(sig);
break;
}
}
return NULL;
}
}
SignalThread::SignalThread() :
magic_memory(MAGIC_MEMORY),
thread(pthread_self())
{
pthread_mutex_init(&shutdown_mutex, NULL);
sigemptyset(&set);
if (bool(getenv("LIBTEST_IN_GDB")) == false)
{
sigaddset(&set, SIGALRM);
sigaddset(&set, SIGABRT);
sigaddset(&set, SIGQUIT);
sigaddset(&set, SIGINT);
sigaddset(&set, SIGVTALRM);
}
sigaddset(&set, SIGPIPE);
sigaddset(&set, SIGUSR2);
sem_init(&lock, 0, 0);
sigemptyset(&original_set);
pthread_sigmask(SIG_BLOCK, NULL, &original_set);
}
bool SignalThread::setup()
{
set_shutdown(SHUTDOWN_RUNNING);
if (sigismember(&original_set, SIGQUIT))
{
Error << strsignal(SIGQUIT) << " has been previously set.";
}
if (sigismember(&original_set, SIGINT))
{
Error << strsignal(SIGINT) << " has been previously set.";
}
if (sigismember(&original_set, SIGVTALRM))
{
Error << strsignal(SIGVTALRM) << " has been previously set.";
}
if (sigismember(&original_set, SIGUSR2))
{
Error << strsignal(SIGUSR2) << " has been previously set.";
}
int error;
if ((error= pthread_sigmask(SIG_BLOCK, &set, NULL)) != 0)
{
Error << "pthread_sigmask() died during pthread_sigmask(" << strerror(error) << ")";
return false;
}
if ((error= pthread_create(&thread, NULL, &sig_thread, this)) != 0)
{
Error << "pthread_create() died during pthread_create(" << strerror(error) << ")";
return false;
}
sem_wait(&lock);
return true;
}